//
//  KMAngleIndicateView.swift
//  PDF Master
//
//  Created by lizhe on 2023/11/22.
//

import Cocoa

enum KMAngleIndicateViewStyle {
    case left45
    case horizontal
    case right45
}

class KMAngleIndicateView: NSView {
    var touchCallBack: (() -> Void)?
    private var gradient: NSGradient?

    var isSelcted: Bool = false {
        didSet {
            if isSelcted {
                layer?.borderWidth = 0.5
            } else {
                layer?.borderWidth = 0
            }
            needsDisplay = true
        }
    }

    var style: KMAngleIndicateViewStyle = .horizontal

    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        if isSelcted {
            let path = NSBezierPath(roundedRect: bounds, xRadius: 1, yRadius: 1)
            gradient?.draw(in: path, relativeCenterPosition: NSPoint(x: 0, y: 1))
            wantsLayer = true
            layer?.backgroundColor = NSColor.clear.cgColor
            layer?.cornerRadius = 0
            layer?.borderWidth = 0
            layer?.borderColor = NSColor.clear.cgColor

            shadow = NSShadow()
            layer?.shadowColor = NSColor.clear.cgColor
            layer?.shadowOffset = CGSize(width: 0, height: 0)
            layer?.shadowRadius = 0
        } else {
            wantsLayer = true
            layer?.backgroundColor = NSColor.white.cgColor
            layer?.cornerRadius = 1
            layer?.borderWidth = 0.5
            layer?.borderColor = NSColor.black.withAlphaComponent(0.15).cgColor

            shadow = NSShadow()
            layer?.shadowColor = NSColor.black.withAlphaComponent(0.2).cgColor
            layer?.shadowOffset = CGSize(width: 0, height: -1)
            layer?.shadowRadius = 0.5
        }

        if let context = NSGraphicsContext.current?.cgContext {
            // Middle color block
            context.saveGState()

            if style == .left45 {
                context.translateBy(x: bounds.width / 2, y: bounds.height / 2)
                context.rotate(by: CGFloat.pi / 4)
                context.addRect(CGRect(x: -4, y: -6, width: 8, height: 12))
                context.setFillColor(NSColor(calibratedRed: 117/255, green: 119/255, blue: 128/255, alpha: 1.0).cgColor)
                context.fillPath()
            } else if style == .horizontal {
                context.translateBy(x: bounds.width / 2, y: bounds.height / 2)
                context.addRect(CGRect(x: -4, y: -6, width: 8, height: 12))
                context.setFillColor(NSColor(calibratedRed: 117/255, green: 119/255, blue: 128/255, alpha: 1.0).cgColor)
                context.fillPath()
            } else if style == .right45 {
                context.translateBy(x: bounds.width / 2, y: bounds.height / 2)
                context.rotate(by: -CGFloat.pi / 4)
                context.addRect(CGRect(x: -4, y: -6, width: 8, height: 12))
                context.setFillColor(NSColor(calibratedRed: 117/255, green: 119/255, blue: 128/255, alpha: 1.0).cgColor)
                context.fillPath()
            }

            context.restoreGState()
        }
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        gradient = NSGradient(starting: NSColor(calibratedRed: 237/255, green: 236/255, blue: 237/255, alpha: 1.0),
                              ending: NSColor(calibratedRed: 210/255, green: 209/255, blue: 210/255, alpha: 1.0))
    }

    override func mouseUp(with event: NSEvent) {
        if !isSelcted, let callback = touchCallBack {
            isSelcted = true
            callback()
        }
    }
}